How do you link a bank, bank branch and bank account to a payment method?

So we are setting up a new supplier and would like to use a new bank, bank branch and bank account to pay this supplier.  We will be paying via cash.  My thought was that I set up a new payment method, and tie that to the supplier and supplier site as the default.  However, there is nothing in the payment method setup where you can choose the bank, bank branch and bank account to use for that payment method.  Am I thinking about this the wrong way?  Is there something in the supplier set up where you can choose